US 11,703,355 B2
Method for calibrating an altitude sensing stereo vision device of a UAV
Mats Berggrund, Torslanda (SE)
Assigned to EVERDRONE AB, Säve (SE)
Filed by Everdrone AB, Säve (SE)
Filed on Nov. 2, 2021, as Appl. No. 17/516,952.
Claims priority of application No. 20205432 (EP), filed on Nov. 3, 2020.
Prior Publication US 2022/0136863 A1, May 5, 2022
Int. Cl. G01C 25/00 (2006.01); B64C 39/02 (2023.01); G01C 5/00 (2006.01); G01C 5/06 (2006.01); G05D 1/04 (2006.01); G06Q 10/0832 (2023.01); B64U 10/13 (2023.01)
CPC G01C 25/00 (2013.01) [B64C 39/024 (2013.01); G01C 5/005 (2013.01); G01C 5/06 (2013.01); G05D 1/042 (2013.01); G06Q 10/0832 (2013.01); B64U 10/13 (2023.01)] 15 Claims
OG exemplary drawing
 
1. A method for calibrating an altitude sensing stereo vision device of an unmanned aerial vehicle, wherein the method comprises:
arranging the unmanned aerial vehicle to take off from ground and ascend;
deriving at least one first altitude value from the stereo vision device and obtaining at least one corresponding second altitude value from another device of the unmanned aerial vehicle during the ascent of the unmanned aerial vehicle;
recording the derived at least one first altitude value and the obtained at least one corresponding second altitude value as calibration data;
deriving an additional first altitude value from the stereo vision device while the unmanned aerial vehicle flies a route; and
adjusting the derived additional first altitude value based on the recorded calibration data without having to obtain any new information from the other device after the ascent.